Offered in this auction by Second Vintage Step back into the golden era of Japanese watchmaking with this exceptional Grand Seiko 56GS, a timepiece that perfectly embodies the "Grammar of Design" philosophy established by Taro Tanaka. This specific reference, the 5646-7010 from late 1972, features a luxurious Cap Gold case which provides the warmth and durability of solid gold with the structural integrity of steel. The 56GS series is celebrated by collectors for being the final generation of the classic mechanical Grand Seiko era, blending high-beat precision with practical daily wearability. With its intact gold caseback medallion and signed GS crown, this piece represents a significant chapter in horological history, offering reliable vintage performance wrapped in timeless elegance. Brand: Seiko Model: Grand Seiko Reference Number: 5646-7010 Serial Number: 2N0091 Movement: Automatic Caliber 5646 Dial: Champagne Sunburst Case Size: 37 mm (excluding the crown) Case Material: Cap Gold Production Year: 1972 Condition: Good vintage condition Dial and Hands The watch features a sophisticated champagne sunburst dial that catches the light beautifully, creating a radial shimmer characteristic of high-end Seiko production. It is adorned with multi-faceted applied gold indices featuring black inlays for superior legibility, a signature of the 56GS layout. The matching dauphine hands also feature black striping. The dial proudly displays the applied gold "GS" logo above six o'clock, creating a well-balanced vertical symmetry, alongside the Suwa Seikosha factory symbol. A framed day-date window sits at the three o'clock position. The dial surface is clean, while the hands and indices show a charming, honest patina consistent with its age. Case and Crystal The defining feature of this model is its substantial Cap Gold case, a superior technique to standard gold plating where a thick layer of gold is mechanically bonded to the steel core. The case retains the sharp, geometric lines and flat surfaces typical of the Tanaka design grammar, though it shows surface scratches and wear commensurate with its vintage nature. The original "GS" signed crown is present. The caseback is distinct, featuring the coveted gold "GS" medallion in the center, which remains intact and visible, surrounded by the correct engravings indicating the Cap Gold construction. Movement Powering this timepiece is the highly regarded Seiko Caliber 5646, an automatic movement that runs at a high-beat frequency of 28,800 vibrations per hour (4Hz). This movement was designed to offer chronometer-grade accuracy and durability. The movement is clean and presents well, offering reliable vintage performance and running within vintage tolerances. Strap The watch is fitted with a dark brown leather strap featuring matching stitching. The rich tone of the leather provides a handsome contrast to the warm hues of the gold case, enhancing the dress-watch aesthetic suitable for both formal and casual settings. Condition This timepiece is rated in good vintage condition. It is an honest example that has been worn and enjoyed, evidenced by surface marks and scratches on the gold-capped case and some softening of the edges. The gold medallion on the caseback shows typical texture and wear but remains clearly identifiable. The dial is well-preserved, with the primary signs of aging restricted to the metal furniture of the hands and markers. Dimensions The case measures 37 mm in diameter excluding the crown, a classic size that offers significant wrist presence due to the angular lugs and wide bezel design. It sits comfortably on the wrist, balancing vintage proportions with modern wearability. Remarks The 56GS reference 5646-7010 is widely considered one of the most wearable and attractive vintage Grand Seikos. Its combination of an automatic high-beat movement, day-date complication, and the robust Cap Gold case makes it a practical choice for the modern collector. Finding an example with the gold medallion still present on the caseback is increasingly difficult, adding to the desirability of this specific lot. History Introduced in 1970, the 56GS series was produced by the Suwa Seikosha factory and marked a high point in Seiko's mechanical watchmaking before the quartz revolution fully took hold. These watches were manufactured with automated assembly lines that allowed for high precision at a larger scale. The 56GS was designed to be thin, accurate, and comfortable, serving as the daily-wear luxury watch for the discerning Japanese executive of the 1970s. It stands today as a testament to Seiko's pursuit of perfection and their ability to challenge the Swiss watch industry on quality and finish. Payment and Shipping Payment must be completed within 1-3 days after purchase. The watch will be securely packaged and shipped with tracking and insurance for your peace of mind. Please review the pictures carefully before bidding. We strive to showcase the watch from multiple angles for an accurate representation. As with all vintage watches, water resistance is not guaranteed. The watch will be delivered in fully functional working condition. If you have any questions, feel free to contact us after the auction ends. /Second Vintage SKU: SEI6SAAUG0000